PH64687: CHILD ENCLAVE TERMINATION ATTEMPTS TO FREE FILE DYNAMICALLY ALLOCATED BY THE PARENT ENCLAVE USING AN ENVVAR FOR AMODE64

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• The runtime tracks files allocated dynamically using the
  environment variable method at the region level, but tries to
  free them at enclave termination. In the absence of child
  enclaves this is not a problem.
  
  However, with a child enclave, termination may try to free a
  file still open in the parent enclave, leading to an IKJ56861I
  FILE ... NOT UNALLOCATED, DATA SET IS OPEN failure, to which
  termination responds by deleting the record of the file having
  been allocated. If the parent enclave then reopens the affected
  file, another allocation is attempted, leading to a IKJ56246I
  DATA SET ... NOT ALLOCATED, FILE IN USE, with the open failing
  with file status 98.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users of Enterprise COBOL 6.3 and later      *
  *                 releases running AMODE 64 programs that use  *
  *                 files dynamically allocated through the      *
  *                 COBOL runtime and create nested enclaves     *
  *                 for one or more dynamically called           *
  *                 program(s).                                  *
  ****************************************************************
  * PROBLEM DESCRIPTION: Nested (child) enclave termination      *
  *                      attempts to free files on child         *
  *                      enclave termination of the CALLEE but   *
  *                      the file(s) dynamically allocated       *
  *                      through the COBOL runtime cannot        *
  *                      be freed if it is open in the parent    *
  *                      enclave, and runtime error recovery     *
  *                      removes the record of the file having   *
  *                      been allocated. If record of a file     *
  *                      having been dynamically allocated is    *
  *                      removed, reopening the file attempts    *
  *                      to reallocate it when it is in fact     *
  *                      still allocated, which fails the open.  *
  *                                                              *
  *                      For example, if a child enclave         *
  *                      is created for called COBOL             *
  *                      programs (CALLEE), and the              *
  *                      caller COBOL programs (CALLER) have     *
  *                      files dynamically allocated through     *
  *                      the COBOL runtime open and in           *
  *                      use, on child enclave termination of    *
  *                      the CALLEE, the files dynamically       *
  *                      allocated through the COBOL runtime     *
  *                      in use in the CALLER is                 *
  *                      incorrectly closed and use of that file *
  *                      is lost within the LE process where the *
  *                      multiple enclaves reside.               *
  ****************************************************************
  * RECOMMENDATION: Install the provided PTF.                    *
  ****************************************************************
  The COBOL runtime logic for Nested child enclave (CALLEE)
  termination attempted to free files on child enclave termination
  of the CALLEE for file(s) dynamically allocated through the
  COBOL runtime in the parent enclave (CALLER) and no longer
  made those files accessible for use on an LE process level once
  a child enclave was terminated.
  
  COB0603T/K COB0604T/K
  

Problem conclusion

• The COBOL runtime logic has been corrected.
  On enclave termination, files dynamically allocated through the
  COBOL runtime are freed only if the files were allocated in
  the same enclave being terminated.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  UI99733 UI99734

Modules/Macros

• CELQSG04 CELQV004 IGZQAPI  IGZQCA64 IGZQCDA  IGZQINPL IGZQJNI2
  IGZQR004
  

Fix information

• Fixed component name

  LE ENT COBOL LI

• Fixed component ID

  568819812

Applicable component levels

• R7D0 PSY UI99733

     UP25/01/30 P F501

• R7E0 PSY UI99734

     UP25/01/30 P F501

Fix is available

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